Will this work?

v1...rotate

A Reef In The Sky
After some advice guys.

My original plan was to have x2 1.5" CJ Standpipes. These would slip into x2 1.5" bulkheads (slip on the inside and thread on the outside). Then attach 1.5" tubing to the bulkheads which in turn would be attached to 1.5" TUBV before it continues into the sump. However the size of the 1.5" TUBV is just too big for all the plumbing to fit underneath.

Therefore... is this an option?? Considering 1" piping 'only' moves approximately 300-350GPH.

After the x2 1.5" bulkheads, I will use a reducer adapter to bring the pipe size down to 1" (instead of 1.5"). This 1" tubing will attach to a 1" TUBV then the piping continues to the sump. This adjustment in size will allow enough room between TUBV's.

The tank is approximately 137G (520L) so I'm looking at a flow of 685G (2600L) through the sump (x5 times). I want x2 standpipes for redundancy. I can then control the flow using the TUBV. I will not be using gate valves.

The returns will comprise of x2 1" plumbing lines. Again, x2 1" TUBV's connected before the bulkheads. I will use x2 Ehiem Compact+ 5000 pumps (rated at 660-1320GPH or 2500-5000LPH at 0' head)

Will using the reducer (1.5" to 1") work? Any major problems you see with this concept? I want it to be as quiet as possible.

Thanks
 
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